Obligation and necessity

​Must, Have to, Need to.

Let's talk about obligation and necessity.

​Vocabulary

- Online booking

​- Destination

​- Book a flight

​- Search

Some text here about the topic of discussion

- Departure

- Check-out

- ​Make a reservation

- ​Apply for a visa

​Exercise 01

Match the words to make expressions.

Match

Match the following

• Book

• Apply

• check-out

• Book

• Search

a hotel

for a passport

time

a tour

for

• a hotel

• for a passport

• time

• a tour

• for

​Exercise 02

Write a sentence using the expressions.

Open Ended

Write a negative sentence using BOOK.

Open Ended

Write an interrogative sentence using APPLY.

Open Ended

Write an affirmative sentence using SEARCH.

​Must/Have to/Need to

For obligation and necessity.

Use must and the base form to express obligation.

​

MUSTN'T is a modal verb. It works as an auxiliary.

​Must

Use have to and the base form to express necessity.

​

Use not have to and the base form to express lack of necessity.​

​

MUSTN'T is a modal verb. It works as an auxiliary.

​Have to

Use need to and the base form to express necessity.

​

Use not need to to and the base form to express lack of necessity.​

​

MUSTN'T is a modal verb. It works as an auxiliary.

​Need to

Use have got to and the base form to emphasize necessity.

​​

​

Notice that HAVE GOT TO is in Present Perfect.

​Have got to

​Exercise 03

complete the sentence using MUST, HAVE TO, or NEED TO.

Fill in the Blank

I ..................... wear a tie; I do it because I like wearing ties.

Fill in the Blank

In order to log on to the Internet, Sally ..................... enter her user I.D.

Fill in the Blank

If Susana gets a pet dog, you ..................... feed it every day or it will die!

Fill in the Blank

You ..................... apologize; it isn't necessary.

Fill in the Blank

You ..................... apologize; it isn't necessary.

Fill in the Blank

Mom, I don't want to clean my room. (I)..................... it right now?

Fill in the Blank

When a police officer asks to see your driver's license, you ..................... show it to him.

​Exercise 04

On PADLET, slect a topic and write an obligation, a necessity, and something that is not necessary to do.​